Now I know its a highly controversial topic, it's been discussed up and down but honestly, best content so far I could find when using the search function are posts dating back to the time of Mike Hearns etc.

I fully disclose that I am on the side of team "increase the block size", at least to 4MB for now but what is it that opponents worry so much?
It is absolute clear that all the arguments against increasing the blocksize are not justified, at least not anymore considering the current miner landscape.
Lightning is not the solution. Not for me!

So what is in the way of going there? most miners would support the change.

Aware that with 4MB, we would reach the limit again, but at least for now, BTC would be back to be what it was

Then talking of which, why not reduce block time to ~5 minutes while we are at it? Whats the exact trade-off between 5 and 10 minutes?